JAVA 調用C 語言程序，並且進行傳參收結果等操作

對於以下命令：

 

ls /var/log/nginx/access.log.*

 

ls /var/log/nginx/access.log.* | grep 2011-05-16

 

grep "test=123&name=opencfg.com" /var/log/nginx/access.log.* > /root/alert.log

 

類似這樣的命令，process.exec是不會理解其中的*號與> 甚至管道符號|

 

這是由於在linux環境下，我們一般使用bash shell調用這些命令， 而其中的一些符號 諸如：

 

*, ?, >, < , | 這樣的符號是通過/bin/bash -c來做解釋後再傳遞給 所調用的命令

 

/bin/bash -c 這個參數已經作爲默認命令，在系統啓動時加載到運行環境中，所以我們敲以上命令的時候可以省略

 

但對於java的Process來說，不會識別這些符號，因此我們必須強制調用/bin/bash -c來幫我們做符號解釋:

 

 

下邊是一段測試代碼：

 

import java.io.BufferedReader;
import java.io.InputStreamReader;

/**
 * CommandTest
 *
 * @author opencfg.com
 * @since 0.0.1-SNAPSHOT
 * @version 0.0.1-SNAPSHOT
 * @date 2011-05-17
 */
public class CommandTest {

    public static void main(String[] args) throws Exception {
        // 1.test console args commands
        // exec("args", args);

        String[] commands = new String[] { "/bin/bash", "-c", "grep -h 200.*370.*http /var/log/nginx/access.log.* > /root/test_123.log" };
        String[] commands_ls = new String[] { "/bin/bash", "-c", "ls /var/log/nginx/access.log.*" };

        // 1.test java string commands
        exec("commands", commands);
    }

    public static void exec(String message, String[] args) throws Exception {
        print(message + ":");
        Process process = Runtime.getRuntime().exec(args);
        for (String arg : args) {
            System.out.println(arg);
            System.out.print(" ");
        }
        BufferedReader errorReader = new BufferedReader(new InputStreamReader(
                process.getInputStream()));
        String line = null;
        while ((line = errorReader.readLine()) != null) {
            System.err.println(line);
        }
        errorReader.close();
        BufferedReader infoReader = new BufferedReader(new InputStreamReader(
                process.getErrorStream()));
        while ((line = infoReader.readLine()) != null) {
            System.out.println(line);
        }
        infoReader.close();
        print("");
    }

    public static void print(String[] args) {
        for (String arg : args) {
            System.out.println(arg);
            System.out.print(" ");
        }
    }

    public static void print(String arg) {
        System.out.println(arg);
    }

}

特別需要注意的是，當需要執行的linux命令帶有管道符時（例如：ps -ef|grep java），用上面的方法是不行的，解決方式是將需要執行的命令作爲參數傳給shell

public class Test {
    public static void main(String[] args) throws Exception{
        String[] cmds = {"/bin/sh","-c","ps -ef|grep java"};
        Process pro = Runtime.getRuntime().exec(cmds);
        pro.waitFor();
        InputStream in = pro.getInputStream();
        BufferedReader read = new BufferedReader(new InputStreamReader(in));
        String line = null;
        while((line = read.readLine())!=null){
            System.out.println(line);
        }
    }
}

find / -name "*mysql*" -print 時，用如下代碼
       
try            
String[] commands = new
String[]{"find",".","-name","*mysql*","-print"};
           
Process process = Runtime.getRuntime().exec (commands);
           
InputStreamReader ir=new
InputStreamReader(process.getInputStream());
           
BufferedReader input = new BufferedReader (ir);
           
String line;
           
while ((line = input.readLine ()) != null){
               
System.out.println(line);
        
}//end try
       
catch (java.io.IOException e){
           
System.err.println ("IOException " + e.getMessage());
3)執行一個自己寫的腳本
非常簡單，只需要在構造commands時寫出它的詳細路徑和文件名，及參數等。
   try
           
String commands = "/root/test/checkfile.sh";
           
Process process = Runtime.getRuntime().exec (commands);
           
InputStreamReader ir=new
InputStreamReader(process.getInputStream());
           
BufferedReader input = new BufferedReader (ir);
           
String line;
           
while ((line = input.readLine ()) != null){
               
System.out.println(line);
        
}//end try
       
catch (java.io.IOException e){
           
System.err.println ("IOException " + e.getMessage());
 
如果命令中有參數，同2）要用數組的形式。

import java.io.*;

import java.lang.*;
class test3{
       public static void main(String []args) throws IOException{
                long a = System.currentTimeMillis();
                Process process = Runtime.getRuntime().exec("/home/zhangdi/traceroute_l");//這是外部程序所在目錄，切記返回類型爲process
                PrintStream outputWriter = new PrintStream(new BufferedOutputStream(process.getOutputStream()));
                outputWriter.println("218.198.33.204");
                outputWriter.flush();//這裏一定要刷新緩衝區，不然參數傳不過去
                outputWriter.println("-T");
                outputWriter.flush();
                outputWriter.println("-80");
                outputWriter.flush();
                outputWriter.println("4");
                outputWriter.flush();
                outputWriter.println("192.168.1.30");
                outputWriter.flush();
                BufferedReader addResult = new BufferedReader(new InputStreamReader(process.getInputStream()));
                String line;
                while((line=addResult.readLine())!=null)
                {
                     
                        System.out.println(line);
                 }
                long b = System.currentTimeMillis();
                System.out.println(b-a);
}


}